11531636389 has 16 divisors (see below), whose sum is σ = 14939774080. Its totient is φ = 8643723840.

The previous prime is 11531636387. The next prime is 11531636393. The reversal of 11531636389 is 98363613511.

It is a cyclic number.

It is not a de Polignac number, because 11531636389 - 2¹ = 11531636387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531636383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3333042 + ... + 3336499.

It is an arithmetic number, because the mean of its divisors is an integer number (933735880).

Almost surely, 2^11531636389 is an apocalyptic number.

11531636389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11531636389 is a deficient number, since it is larger than the sum of its proper divisors (3408137691).

11531636389 is a wasteful number, since it uses less digits than its factorization.

11531636389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669580.

The product of its digits is 349920, while the sum is 46.

The spelling of 11531636389 in words is "eleven billion, five hundred thirty-one million, six hundred thirty-six thousand, three hundred eighty-nine".